Here is the complete list of unlockable achievements in Battlefield 3 for the Xbox 360.
There are six secret achievements at the bottom of this list.
1st Loser (30) – Finish as 2nd MVP in a ranked match
Army of Darkness (30) – Shoot out the 4 lights with 4 bullets in Night Shift
Army of Two (50) – Complete all co-op missions on Hard
Between a rock and a hard place (15) – Beat Solomon, flawlessly, in The Great Destroyer
Bullseye (20) – Reach and save the hostages without alerting any enemies in Drop ’em Like Liquid
Butterfly (25) – Take down the jet in one attempt in Rock And A Hard Place
Car Lover (20) – Complete the mission without losing a humvee in Operation Exodus
Colonel (50) – Achieve rank 45
Decorated (50) – Obtain one of each ribbon in the game
In the nick of time (20) – Disarm the bomb in under 20 seconds in The Eleventh Hour
Infantry Efficiency (30) – Obtain all 4 weapon efficiency ribbons
Involuntary Euthanasia (25) – Kill the 2 soldiers before the building falls on them in Uprising
It’s better than nothing! (30) – Finish as 3rd MVP in a ranked match
Lock ‘n’ Load (30) – Unlock all unique co-op weapons
M.I.A (20) – Obtain your first enemy Dog Tag
Most Valuable Player (30) – Finish as MVP in a ranked match
Ninjas (20) – Reach the VIP without setting off the alarm in Exfiltration
Not on my watch (25) – Protect Chaffin from the soldiers in the street in Operation Swordbreaker
Ooh-rah! (30) – Complete the campaign story
Practice makes perfect (15) – Headshot each of the targets in the gun range in Kaffarov
Push On (20) – Reach the garage without going into man-down state in Hit and Run
Roadkill (20) – Kick the car to kill the soldiers in Uprising
Scrap Metal (25) – Destroy 6 enemy tanks before reaching the fort in Thunder Run
Semper Fidelis (50) – Complete the campaign story on Hard
Support Efficiency (30) – Obtain all 4 support efficiency ribbons
The Professional (30) – Complete the street chase in Comrades in under 2 minutes 30 seconds without dying
Twofor (15) – Take down 2 enemies with 1 bullet in Night Shift
Two-rah! (30) – Complete all co-op missions
Untouchable (20) – Complete the mission without using the fire extinguisher in Fire From The Sky
Vehicle Warfare (30) – Obtain all 3 vehicle warfare ribbons
What the hell *are* you? (20) – Take a russian Dog Tag in the forest ambush in Rock And A Hard Place
You can be my wingman anytime (30) – Complete Going Hunting in a perfect run
Here are the six secret achievements you can unlock in the game.
FlashForward (10) – Completed Semper Fidelis
No Escape (30) – Captured Kaffarov
Shock Troop (15) – Survived the quake
This is the end (20) – Failed to prevent the attack
Wanted: Dead or Alive (20) – Captured Al Bashir
Where are the other two? (20) – Found the nuke